Sterically Encumbered Iridium Bis(N-heterocyclic carbene) Complexes: Air-Stable 14-Electron Cations and Facile Degenerate C–H Activation
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https://figshare.com/articles/dataset/Sterically_Encumbered_Iridium_Bis_N_heterocyclic_carbene_Complexes_Air_Stable_14_Electron_Cations_and_Facile_Degenerate_C_H_Activation/2461945
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资源简介：
Cationic Ir(III) systems supported by a bis(expanded
NHC) framework
and featuring both agostic C–H and cis alkyl/hydride ligand
sets have been targeted by protonation of the corresponding bis(alkyl)
hydride complexes. Remarkably, the steric shielding afforded by the
NHC substituents is such that these and related putative 14-electron
cations are air and moisture stable. In solution, degenerate fluxional
exchange is brought about by reversible σ-bond activation within
the agostic alkyl C(sp3)–H bond; a non-dissociative
mechanism is implied by the activation parameters ΔH⧧ = 8.8(0.4) kcal mol–1 and ΔS⧧ = −12.2(1.7)
eu.
创建时间：
2012-12-10
